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plumbing

I work at some residential apartments and one of the problems that i am faced with is the ac drain keep making noise. from the 3rd floor too the first floor.If i plug the drain line with my finger it goes away but if I dont it keeps making a noise. I feel air pressure coming up the drain line. What can I do to stop the noise from traveling up the drain lines to each floor without blocking the drain lines ? Can you or anyone help me please ?

Re: plumbing

Re: plumbing

It's making a gurgling sound. In the first floor apt the main line comes up from under neath the foundation too . It's a four inch wide pvc tube where the other 3 drain lines run into it to drain. The main drain ,the big one is pushing air to those other drain lines and making them make a gurgling sound like its dripping but its not.